What makes us orgasmically nostalgic — or is it nostalgically orgasmic? — whenever an oldie but goodie pops up as a “new” trend?

This whole 1970s bohemian thing, for example: It gets my bateau bobbing because I’m still 35 — and holding! — in the fashion part of my brain. Are you concerned that a ’70s look might not be “age-appropriate” for you? Well, get over it, sez I, and then get on board: Staying relevant and looking contemporary may require you to look a little “new,” but who doesn’t want that?

Want to test your way into the look? Let me list five action items that will make you feel like Joni Mitchell, Carly Simon and Ali McGraw, all rolled into one:

Buy this year’s flares. If you make just one trendy purchase this season, let this be it. No extreme bells required or desired — especially those with distressed rips or big patch pockets — just a simple, reinvented boot cut in stretch denim with an even wash.

Look for a higher rise that hits your natural waist (also handy for tucking in your tummy and any muffin tops). The hems should just barely skim the ground. But there’s the rub: To be flattering and leg-lengthening, flares must be paired with higher shoes (see below). Try something like Madewell Flea Market Flares in Carl Wash.

Add stacked heels. Sorry, girlfriends: Wedges may be comfy, but they are so-o-o not sexy. Stacked heels are, however — plus they provide the same sturdy support and height without that bulky “clodhopper” look.

Just don’t go too far (I beg of you!) and get platforms; single-sole stacks are chic not clunky, and they work with all types of jeans — flares, skinnies and boyfriend — as well as with ankle-cropped pants and dresses. Take care, though, to avoid ankle-strap versions that shorten your legs or make your ankles swell. Try any of these or similar: Steve Madden Confdnce (were those pesky vowels cramping their style?!), Rockport Seven to 7 75mm Cross-Strap Sandal or Seychelles Lyra.

Model a midiskirt. This full, breezy, longer A-line skirt defines your waist and lets everything below it breathe free. (Think of it as half a fit-and-flare dress.) Up top, meanwhile, you get to do your own thing: Add a chambray blouse or a crisp white shirt, a fitted tee and ballet flats, a pair of sandals or those new chunky heels.